<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <title>Document</title>
    <style type="text/css">
        .container {
            width: 300px;
            margin: auto;
        }
        
        .container .cart {
            width: 300px;
            margin: auto;
        }
        
        .container .title {
            background-color: lightblue;
            height: 40px;
            line-height: 40px;
            text-align: center;
            /*color: #fff;*/
        }
        
        .container .total {
            background-color: #FFCE46;
            height: 50px;
            line-height: 50px;
            text-align: right;
        }
        
        .container .total button {
            margin: 0 10px;
            background-color: #DC4C40;
            height: 35px;
            width: 80px;
            border: 0;
        }
        
        .container .total span {
            color: red;
            font-weight: bold;
        }
        
        .container .item {
            height: 55px;
            line-height: 55px;
            position: relative;
            border-top: 1px solid #ADD8E6;
        }
        
        .container .item img {
            width: 45px;
            height: 45px;
            margin: 5px;
        }
        
        .container .item .name {
            position: absolute;
            width: 90px;
            top: 0;
            left: 55px;
            font-size: 16px;
        }
        
        .container .item .change {
            width: 100px;
            position: absolute;
            top: 0;
            right: 50px;
        }
        
        .container .item .change a {
            font-size: 20px;
            width: 30px;
            text-decoration: none;
            background-color: lightgray;
            vertical-align: middle;
        }
        
        .container .item .change .num {
            width: 40px;
            height: 25px;
        }
        
        .container .item .del {
            position: absolute;
            top: 0;
            right: 0px;
            width: 40px;
            text-align: center;
            font-size: 40px;
            cursor: pointer;
            color: red;
        }
        
        .container .item .del:hover {
            background-color: orange;
        }
    </style>
</head>

<body>
    <div id="app">
        <div class="container">
            <my-car></my-car>

        </div>
    </div>
    <script type="text/javascript" src="../vue.js"></script>
    <script type="text/javascript">
        var cartTitle = {
            props: ['title'],
            template: `  <div class="title" >{{title}}商品</div>`
        }

        var cartContent = {
            props: ['list'],
            template: ` <div>
          <div class="item" :key='item.id' v-for='item in list'>
            <img :src="item.img"/>
            <div class="name" >{{item.name}}</div>
            <div class="change">
              <a href="" @click.prevent='sub(item.id)'>－</a>
              <input type="text" class="num" :value='item.num' @blur='changeA(item.id,$event)'/>
              <a href="" @click.prevent='add(item.id)'>＋</a>
            </div>
            <div class="del" @click='del(item.id)'>×</div>
          </div>
        </div>
            `,
            methods: {
                changeA: function(id, event) {
                    this.$emit('change-blur', {
                        type: 'change',
                        id: id,
                        num: event.target.value
                    })

                },
                sub: function(id) {
                    this.$emit('change-blur', {
                        id: id,
                        type: 'sub'
                    })
                },
                add: function(id) {
                    this.$emit('change-blur', {
                        id: id,
                        type: add
                    })
                }


                // 数量的增加和减少通过父组件来计算，每次都是加一和减一，不需要传递数量
                // 父组件需要一个数量类型来判断是加一还是减一，通过type来标识是+，还是-
                    del: function(id) {
                    this.$emit('del-c', id)
                }
            },
        }
        var cartTotal = {
                props: ['list'],
                data: function() {
                    return {

                    }
                },
                template: ` <div class="total">
                <span>总价：{{total}}</span>
                <button>结算</button>
            </div>`,
                computed: {
                    total: function() {
                        // 计算商品的总价
                        var t = 0;
                        this.list.forEach(item => {
                            t += item.price * item.num;
                        });
                        return t;
                    }
                }

            }
            // 父组件
        Vue.component('my-car', {
            data: function() {
                return {
                    title: '李四管',
                    list: [{
                        id: 1,
                        name: 'TCL彩电',
                        price: 1000,
                        num: 1,
                        img: 'img/a.jpg'
                    }, {
                        id: 2,
                        name: '机顶盒',
                        price: 1000,
                        num: 1,
                        img: 'img/b.jpg'
                    }, {
                        id: 3,
                        name: '海尔冰箱',
                        price: 1000,
                        num: 1,
                        img: 'img/c.jpg'
                    }, {
                        id: 4,
                        name: '小米手机',
                        price: 1000,
                        num: 1,
                        img: 'img/d.jpg'
                    }, {
                        id: 5,
                        name: 'PPTV电视',
                        price: 1000,
                        num: 2,
                        img: 'img/e.jpg'
                    }]


                }
            },
            template: `<div class='cart'>
                <cart-title :title='title'></cart-title>
                <cart-content :list='list' @del-c='dellC($event)' @change-blur="chanC($event)"></cart-content>
                <cart-total :list='list'></cart-total>
                </div>`,
            components: {
                'cart-title': cartTitle,
                'cart-content': cartContent,
                'cart-total': cartTotal
            },
            // methods: 里面只能用funciotn
            methods: {
                chanC: function(val) {
                    if (val.type == change) {
                        this.list.some(item => {
                            if (item.id == val.id) {
                                item.num = val.num
                                    // 终止遍历
                                return true
                            }
                        })
                    } else if (val.type == sub) {
                        this.list.som(item => {
                            if (item.id = val.id) {
                                item.num -= 1;
                                return true
                            }
                        })
                    } else if (val.type == add) {
                        this.list.some(item => {
                            if (item.id == val.id) {
                                item.num += 1
                                return true
                            }
                        })
                    }
                },
                dellC: function(id) {
                    var index = this.list.findIndex(item => {
                        return item.id == id
                    })
                    this.list.splice(index, 1);
                }
            },
        })
        var vm = new Vue({
            el: '#app',
            data: {},

        })
    </script>
</body>

</html>